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  <title>Document</title>
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  <script>
    var arr = ['a', 'b', 'c', 'd']
    console.log(arr.indexOf('f'));
    arr.splice(arr.indexOf('a'), 1)
    console.log(arr);

    // var arr2 = ['a', 'b', 'c', 'd']
    // arr2.splice(1, 2);
    // console.log(arr2);
    var obj = {name:'张三',age:'18'}
    console.log([obj]);
  </script>
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